Ah, the final showdown. This battle is way easier than the previous one.
In the two North most spots deploy Rosie and Alicia. In the two south most spots deploy two snipers.
In remaining spots deploy Largo, two more lancers, and an engineer.
Make sure Welkin has all the ammo he can for this battle. Change the Edelweiss so it has as much ammo as it can get.
There are towers located around the Marmota. Maximilian will draw power from three of these towers at a time.
The key is to take out all three towers on your turn, and then do some damage to Maximilian.
You can look at your map to see which towers he is drawing power from. They will have blue lines from the tower to Maximilian.
Select Rosie and have her take out the two South most towers.
Now select one of your snipers and have them take out the North most tower. Now select Welkin.
Move him Northward and have him launch a morter at Maximilian.
Now select the Shamrock. Have him launch a morter at Maximilian.
Select Welkin again and have him launch a morter at Maximilian.
At this point he will be at about half health.
He will throw away his shield, vanish and appear a little ways to the North. Select your engineer.
Run her to Welkin to refill his ammo, and then have her heal Rosie.
Run her back South and hide her behind the walls where your troops started. Save your remaining two command points.
Once again and see which of the towers on your map have blue lines to Maximilian. Those are the towers you need to take out.
Select Rosie, and have her take out the South most tower.
Select one of your snipers and have them take out the North most tower. The armored towers should be taken out with a lancer.
Select one of your lancers and run them close to the base of the tower. You will have to spend two points to do this. Have them launch two lances at the live tower to take it down.
Once again you will spend two points to do this.
You should have nine command points left. Select Welkin and have him drop a morter on Maximilian.
Select Welkin again, and have him drop another morter on Maximilian.
Once again select Welkin, and have him drop another morter on Maximilian.
One last time, select Welkin, and have him drop a morter on Maximilian.
Now select your engineer, and run to Welkin to refill his ammo.
Have her take out the South most tower.
Select one of your snipers, and have them take out the North most tower that Maximilian is drawing power from.
You will have to shoot it twice, so this will take two shots.
Now select Largo, and him take out the middle tower that Maximilian is drawing power from.
Once again this will take two shots, and require two command points. I missed once so this took me an extra command point.
Now select Welkin, and have him lob a morter at Maximilian.
Select Welkin again, and lob a morter at Maximilion.
One last time select Welkin, and lob a morter at Maximilian. That's it. You've beat him!